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Source: — Problem Solving |

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by Brent@GMATPrepNow » Sun Feb 17, 2013 10:35 pm
kkadvent wrote:How to solve this type of questions quickly?

If N is product of all integers from 1 to 30, how may prime factors does N have?
We know that all of the prime numbers in the product will be prime factors.
So, the prime factors are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29 (any other factors will not be prime)
There are 10 in total

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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